23 lines
1001 B
NASM
Executable File
23 lines
1001 B
NASM
Executable File
DATA SEGMENT
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NUM1 DD 11451400H ; 被加数
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NUM2 DD 19198100H ; 加数
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SUM DD ? ; 结果
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DATA ENDS
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CODE SEGMENT
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ASSUME CS:CODE, DS:DATA
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start:
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MOV AX, DATA
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MOV DS, AX
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MOV AX, WORD PTR NUM1 ; 将NUM1低位赋给AX
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MOV WORD PTR SUM, AX ; 将AX赋给SUM低位(MOV指令不能直接在两个内存单元间赋值)
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MOV AX, WORD PTR NUM2 ; 将NUM2低位赋给AX
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ADD WORD PTR SUM, AX ; 将AX加到SUM的低位上
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MOV AX, WORD PTR NUM1+2 ; 将NUM1高位赋给AX
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ADC WORD PTR SUM+2, AX ; ADC(Add with Carry)将AX加到SUM的高位(初始为零)上，再加上CF存着的低位进位
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MOV AX, WORD PTR NUM2+2 ; 将NUM2高位赋给AX
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ADD WORD PTR SUM+2, AX ; 将AX加到SUM的高位上
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MOV AH, 4CH ; 退出程序
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INT 21H
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CODE ENDS
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END start |